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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: widen-one-level    [was: Emacs's handling of line numbers]
Date: Mon, 19 Apr 2010 15:57:06 -0400
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References: <qmhzl3a2v5m.fsf@ts-rhel4.hpl.hp.com><jwvd4068dsr.fsf-monnier+emacs@gnu.org><qmhochpy6hu.fsf@ts-rhel4.hpl.hp.com><jwvr5mlwh2q.fsf-monnier+emacs@gnu.org><qmhpr1yrgc9.fsf@ts-rhel4.hpl.hp.com>
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If we add a stack of buffer boundaries, we need an easy way to pop
out of all levels.  The natural thing is that ESC ESC ESC should do it.